Probiotics are living microorganisms that are safe for human consumption and have beneficial effects on human health. The main field of researches on probiotics has been in the gastrointestinal tract. However, in recent years oral health has also been in the scope of research. In this review, the mechanisms of probiotic actions in oral cavity and researches that deal with oral health are evaluated. Consumption of probiotic dairy products and administration of medical device containing probiotics are assessed in perspective of oral therapy. Health benefits of probiotics have been demonstrated both in vitro and in vivo studies. It is concluded from this review that much more investigations should be held to make the effects of probiotics clear; so that probiotic therapy can be recommended for oral health purposes.